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Kotlin Developer - Contract (Outside IR35).

Kotlin (or another JVM based language).

You'll work across Kotlin backend services and React/TypeScript frontends, while helping shape modern CI/CD pipelines and internal AI tooling. What you'll be doingBuild and scale backend services using Kotlin & JVM frameworksDevelop sleek, responsive UIs with React + TypeScriptOwn code fr.

A strong background in software development using Java, Kotlin, or similar.

This role involves backend engineering with a strong focus on distributed systems, requiring skills in Java, Kotlin, and AWS or Azure.

The ideal candidate will have strong expertise in JVM languages like Java or Kotlin and deep experience with cloud-native architecture.

A leading financial services firm in Greater London seeks a Software Engineer III to join the FX Services Technology team.This role involves executing software solutions, developing high-quality production code, and contributing to agile team dynamics.Candidates should have a bachelor's degree in a

Ideal candidates will have expertise in Kotlin and experience in mobile testing.

Java & Kotlin (More Serverside Kotlin, the better!).

The ideal candidate should have experience in native mobile application development, particularly in Swift or Kotlin, and a passion for delivering high-quality code.

We primarily use Jvm based languages (Java/Kotlin) but we also have parts of the platform that use other languages as needed.

Familiarity with Kotlin or willingness to learn. Expert knowledge of Java/Scala/Kotlin.

This position demands expertise in backend development using Kotlin and frontend technologies like React and Next.

A leading online gaming company in the United Kingdom is seeking a Senior Software Engineer III with a strong proficiency in Kotlin and Java.

A leading fintech company in the UK is seeking a Remote Full-Stack Developer specializing in Kotlin and Java with a focus on AI-driven solutions.

Ideal candidates will have strong experience with backend services in Python or Kotlin, and a passion for customer experience.

Expert Kotlin Proficiency: Deep experience with Kotlin and its modern ecosystem; you are someone who keeps abreast of the latest language features. We are seeking Senior Kotlin Developers to join a high-caliber engineering team delivering critical solutions for a global financial leader. You will jo

A global travel company based in the UK is seeking a Software Engineer II (Android) to join its mobile team.This role supports remote-first working with flexibility in location.You will work primarily on Android systems, collaborate with product and design teams, and participate in various engineeri

The role requires a Bachelor's degree and at least 2 years of experience in Java or Kotlin programming.

The ideal candidate will have a platform engineering mindset, good knowledge of Kotlin and Compose, and a willingness to work on build tooling.

The role requires a strong foundation in JVM-based development, preferably Kotlin, along with robust SQL experience and knowledge of automated testing.

The ideal candidate will have a strong background in Kotlin, Android development, and a collaborative approach to problem-solving.

This fully remote role involves developing high-impact mobile applications using Kotlin, collaborating with cross-functional teams, and maintaining high standards of code quality.

The ideal candidate has a Bachelor's in Computer Science and at least 2 years of experience with Kotlin and Android development.

Candidates will work with React and Kotlin, developing a cutting-edge research platform.

Senior Software Engineer (JVM, Kotlin). Strong foundation in JVM-based development (Kotlin preferred, Java welcome).

AWS* GraphQL (it would be nice if you were familiar with this but it’s not a deal breaker)* Postgres* RabbitMQ* Docker* Kubernetes* React & React Native, TypeScript, MobX, Redux, Stylus and SASS* We build our Kotlin projects using Gradle and GitHub Actions, deploying to production

At Katanox we're looking for a Full Stack Engineer (Kotlin, React) to join our team. We are looking for a Full Stack Engineer who is equally comfortable building robust backend services in Kotlin and crafting polished, performant UIs in React. Design, build, and maintain Kotlin‑based backend servi

A leading AI-driven insurance technology firm is looking for a Senior Backend Engineer to develop scalable data systems in Kotlin.

Newest tech stack (Kotlin with Spring Boot, KMM, SwiftUI, Kotlin). Building a secure and performant backend solution on Kotlin. Significant experience with backend development and maintenance using Kotlin or Java.

The ideal candidate will have a Bachelor's degree in a related field, over 5 years of experience in software engineering, and strong skills in Java and Kotlin.

A tech innovation firm is seeking a Kotlin Coding Specialist for a freelance AI Trainer project. This remote position focuses on evaluating and optimizing AI-generated code, implementing Kotlin solutions, and documenting modern Android practices.

A leading healthcare technology provider is seeking a remote Backend Developer proficient in Kotlin and Java.

A leading technology firm is looking for a Senior Software Engineer to design and build backend services for a scalable marketing platform.The ideal candidate has strong JVM-based development skills, experience with data-driven APIs, and a solid background in SQL.This role involves owning API design

Ownership and delivery on components (Java/Kotlin) within the Core Prime Brokerage platform; hands‑on development.

Key qualifications include over 5 years of Android development experience in Kotlin, knowledge of mobile analytics, and performance optimization skills.

Kotlin Coding Specialist – AI Trainer. Kotlin Coding Specialist – AI Trainer. AI systems to understand and generate world-class Kotlin code.

A leading global crypto company is seeking a Software Engineering Intern to support the development of APIs for crypto trading and gain experience in building Kotlin-based backend systems.

The ideal candidate must have a strong knowledge of Kotlin and a willingness to learn new technologies.

A prominent insurance technology firm is seeking a mid-senior level Software Engineer to create impactful software.The successful candidate will provide technical leadership while working in agile teams.Responsibilities include building web-based applications and maintaining APIs, as well as mentori

Remote Full-Stack Developer (Kotlin/Java/React + AI Focus). You will primarily work with Kotlin/Java on the backend and TypeScript on the frontend, with significant exposure to our Electron desktop application and billing/accounts systems. Design and implement server-side logic using Spring Webflux

The ideal candidate will have experience with Java 9+, Spring Boot, and Kotlin, along with a solid background in eCommerce.

Java / Kotlin Developer Digital Assets (German-speaking). Strong proficiency in Java/Kotlin, experience with Spring Boot and RESTful Services.

The ideal candidate will have over 4 years of experience, proficient in Kotlin and Android development.

The ideal candidate has strong experience in Java or Kotlin and Spring Boot to build reliable, scalable applications.

The successful candidate will have at least 2 years of experience in Android development using Kotlin and be familiar with cloud messaging APIs and micro-services.

Candidates should have experience in JVM-based languages, particularly Kotlin, and familiarity with Agile practices.